Add type stubs for mido MIDI library

- Created type stubs for various modules in the mido library including messages, midifiles, parser, ports, sockets, syx, tokenizer, and version.
- Implemented type hints for functions and classes to improve type checking and code clarity.
- Added support for MIDI over TCP/IP in sockets module.
- Included methods for reading and writing SYX files in syx module.
- Enhanced the parser functionality with a dedicated Parser class for MIDI byte streams.
- Established a structure for MIDI file handling with MidiFile and MidiTrack classes.

typings/mido/messages/__init__.pyi

@@ -0,0 +1,19 @@
+from .checks import check_time
+from .messages import BaseMessage, Message, format_as_string, parse_string, parse_string_stream
+from .specs import MAX_PITCHWHEEL, MAX_SONGPOS, MIN_PITCHWHEEL, MIN_SONGPOS, SPEC_BY_STATUS, SPEC_BY_TYPE, SPEC_LOOKUP
+
+__all__ = [
+    "MAX_PITCHWHEEL",
+    "MAX_SONGPOS",
+    "MIN_PITCHWHEEL",
+    "MIN_SONGPOS",
+    "SPEC_BY_STATUS",
+    "SPEC_BY_TYPE",
+    "SPEC_LOOKUP",
+    "BaseMessage",
+    "Message",
+    "check_time",
+    "format_as_string",
+    "parse_string",
+    "parse_string_stream",
+]